Steam-engine governor



(No Model.) S. E. JARVIS.

' STEAM ENGINE GOVERNOR. No. 280,042. Patented June 26, 1883.

UNITED STATES PATENT OFFICE.

SAMUEL E. JARVIS, OF LANSING, -MICHIGAN.

STEAM-ENGINE GOVERNOR.

' SPECIFICATION forming part of Letters Patent No. 280,042, dated June 26, 1883.

Application filed April 3, 1883.

To all whom it may concern/.-

Be it known that I, SAMUEL E. JARVIS, of Lansing, in the county of Ingham and State of Michigan, have invented new and useful Improvements in Steam-Engine Governors; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

The improvement herein described relates to automatic cut-off-valve governors, and it is especially intended to form an improvement upon a similar device for which I recently applied for a patent, and which was allowed and numbered 273,999, March 13, 1883.

The improvement consists in providing the single governor-weight shown in my device with a counterbalance weight sov arranged with relation to the center of motion that it will counterbalance the governor-weight in any of its positions, all as more fully herein de'-' scribed.

In the drawings, Figure 1' is an elevation of my single-weight governor as patented to me by the above-mentioned Letters Patent with my improvement attached thereto. a section on the line X X thereof.

The construction and operation of the gov- Fig. 2 is ernor shown in the drawings are fully explained in the abovementioned Letters Patent; but I will shortly recapitulate its main features and operation.

A is a disk securedupon the shaft B.

O is the cut-off eccentric, secured to the disk by means of the links D D.

E is the governor-weight; F, a rod by means of which the governor-weight is exerting its centrifugal force to regulate the relative position of the eccentric.

It is clear that the governor-weight E is not acted upon alone by its centrifugal force when the device is in operation, but also by its force of gravity, which exerts a constantlyvarying influence and effects the action of the governor injuriously, especially when running at low speed, and it is to eliminate this factor of gravity that.I make use of a counterbalance-weight, G, which is pivotally attached to the disk at H, and connected with the governor-weight, E, by a link, I, in such manner that both weights counterbalance each other at any position of the disk and leave the (No model.)

weights free to follow the impulse of the centrifugal force alone. In the drawings the counterbalance-weight G is so pivoted in relation to the direction of rotation of the disk that its centrifugal force at a low speed of the governor either counteracts to some extent the centrifugal force of the governor-weight E'or is in aperfect neutral position; but when the speed increases its centrifugal'force will grow rapidly and be added to the one of the governor-weight E. This arrangement therefore gives to my governor a great sensitiveness at high speed with comparatively small weights. It has a larger range of governing than without the weight G, as the latter is enabled to V 1.. In a single-weight governor, the balanceweight G, so arranged with relation to the center of motion that it will by means of a linkconnection counterbalance the force of gravity of the governing-weight E at all positions thereof, substantially as and for the purposes described.

2. In a cutoff governor, the two governingweights E G, one of which forms the actuat ing force of a lever of the first degree, the other one of the second degree, and in combination with the connecting-link I, whereby the force of gravity of the two weights is counterbalanced and their centrifugal force directly combined, substantially as described. 7

3. A cut-off governor in which the two governing-weights are connected by a link,

whereby their fo'rceof gravity is balanced and their centrifugal forces directly combined, the weight G being pivoted behind its center of gravity, substantially as and for the purpose described. 7

S. E. JARVIS.

Witnesses:

WV. A. WVILooX, W. DONOVAN. 

